I too concede the space, and if necessary stop, and always try to remember the old guidance about giving a cyclist as much space as a car when overtaking. But it really is an effort sometimes, because cyclists so often claim the moral high ground.
A couple of years ago, in a car, I came out of one of the roads onto Thurleigh Road - possibly Hillier, I'm not sure. I didn't see a cyclist coming down at speed, tight to the kerb, until the last moment, and then braked hard. Thank God there wasn't an accident. I immediately apologised - to be greeted with a volley of "what the f__k do you think you are doing". I said that I was trying to apologise, to which the response was "don't f__cking well try to excuse yourself". Then I gave up.
Cyclists so seldom acknowledge one giving way that one remembers when they do. Perhaps they might remember that a "thank you" gesture costs very little.